Hot-gas valve



(No Model.) J. T. CHRISTIE.

HOT GAS VALVE.

No. 541,990. Patented July 2, 1995.

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HOT-GAS VALV.

SPECIFICATION forming* part of Letters Patent No. 541,990, dated uly 2, 1895.

Application filed December 2l, 1894. Serial No. 532|547 (N0 model) To a/ZZ whom it may concern:

Be it known that I, JOHN T. CHRISTIE, a citizen of the United States, residing at Troy, county of Rensselaer, and State of New York, have invented certain new and useful Improvements in Hot-Gas Valves, of which the following is a specitication.

Theinvention relates to such improvements, and consists of the novel construction and combination of parts hereinafter described and subsequent] y claimed.

Reference may be had to the accompanying drawings, and4 the letters of reference marked hereon, which form a part of this specificaion.

Similar letters refer to similar parts in the several figures therein.

Figure 1 is a central vertical section of my improved valve in an open position. Fig.2 is a similar section, taken at right angles to the section-plane of Fig. l,showing the valve closed. Fig. 3 is a cross-section of the gate taken on the broken line 3 3 in Fig. 1.

A is the valve-case, which is provided with the passage A', surrounded by the usual at' taching-fianges A2 and annular gate-seat A3.

B is a circular slide-gate adapted to engage with the seat A3 to close the valve in one direction in the usual manner.

A4 is a pocket in the case adapted to receive the gate when the valve is opened.

A5 is the valve-stem screwed into the upper edge of the valve and movable endwise through the usual stuffing-box A6.

The slide-gate is made hollow, forming an inclosed chamber B which is divided into two compartments B2 and B3 by the diaphragm B4, which connects the opposite side walls of the chamber. The two compartments communicate with each other through a passage B5 at the lower end of the diaphragm which does not extend to the bottom of the chamber. The upper edge wall of the chamber is provided with two screw-th readed openings, one in each compartment. Each of these openings is provided with a pipe or tube screw-threaded at its lower end and inserted to form a water-tight joint. One of these pipes, as C, is the inlet-pipe leading into the compartment B?, and the other pipe C is the outlet-pipe adapted to discharge from compartment B3. Each ofthe pipes is movable endwise through a pair of stuffing-boxes C2 and C3 and within a fixed pipe. The fixed pipe C4 is adapted to be coupled, as by coupling C5, with a water-supply pipe, and the fixed pipe C6 with a waste-pipe. The pipes C4 and C6 are respectively screwed into the upper stuffing-boxes, which forms a watertight connection between the movable meinbers of each set of telcscoping pipes. The lower stufiing-boxes form a gas-tight connection between the movable pipes and the valvecase. The glands C7 and G8 are supported by bolts C9 connecting the gland-flanges G10 with their respective boxes, as shown in Fig. 2.

The upper stuffing-boxes are supported at the proper distance above the lower boxes by means ol the connecting-bolts C12. As these bolts hold the stuffing-boxes C? rigidly and at a considerable distance from the tixed valveoase, they hold the said boxes and the pipes C4 and GG in a stable manner, and stabilityis further insured by the couplings G5, adapted to connect with xed outlet and inlet pipes. The construction enables the rubber pipes heretofore employed in connection with similar valves to be dispensed with and also affords a very stable and smoothly-operating connection between the pipes C C and C4 C6, whereby the valve is accurately guided to and from its seat and binding ofthe parts obviated. Bot-h ends of each of these bolts are provided with a fixed stop or annular flange, as C13, and screwthreaded. The lower ends are screwed into threaded apertures in the box-casting and the upper ends are passed through apertures inthe casting ofthe upper stuingboxes until the upper flanges engage the casting, where they are supported by nuts, as C14.

By providing the supply-pipe with a constant supply of water under pressure, I am able to maintain with the apparatus above i described a continuous current of water through the slide-gate which will absorb and carry off all excess of heat which would otherwise be retained by the gate when used in connection with hotl gases. Without some IOO to greatly prolong the life and efliciency of the gates. The diaphragm B4 also serves to strengthen the chamber-Walls of the gate, whereby comparatively thin and light Walls are enabled to resist the gaspressure. The gate-seat is also protectedfrom the hot gas by circulating Water through the Water-passage D formed in the casting comprising the valvecase. The position and direction of this waterpassage are indicated partly by solid and partly by dotted lines.

D and D2 respectively show the inlet and outlet to which the'supply and waste pipes are respectively attached.

I am aware that concentric water-supply pipes have been 'combined with a hydraulicl crane in manner to provide for their rotation, and also to permit a slight endwise motion When the crane-mast is lifted by pressure' in the lifting-cylinder. It is characteristic of my improvement that the telescoping pipes have no rotary motion and that provision is made for endwise movement of slide-gate pipes each through and beyond two stuttingboxes separate from each other but supported by the valve-case, said pipes being also coinbined and adapted to move in and out of other pipes rigidly xed to the boxes and valve-casey and extended beyond said boxes.

What I claim as new, and desire to secure by Letters Patent, is-

The combination of the chainbered slide gate, the fixed valve case having stuffing boxes C3, the stuffing boxes C2 supported from the case by bolts C12, the Water-supply-and-discharge pipes connected to the stuffing boxes C2 and fixed therein against either endwise or rotary motion and provided with couplings C5, and the telescoping pipes C, C' iixed to the slide gate and moving freely through both stuffing boxes and Within the said water-supply-and discharge pipes beyond the boxes, substantially as set forth.

In testimony whereof I have hereunto set my hand this 15th day of December, 189 i.

y JOHN CHRISTIE. lVitnesses:

GEO. A. MosHER, FRANK C. CURTIS. 

